CN103699439A - Device and method for calculating tiles in electronic map visual area - Google Patents
Device and method for calculating tiles in electronic map visual area Download PDFInfo
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- CN103699439A CN103699439A CN201310744408.5A CN201310744408A CN103699439A CN 103699439 A CN103699439 A CN 103699439A CN 201310744408 A CN201310744408 A CN 201310744408A CN 103699439 A CN103699439 A CN 103699439A
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Abstract
The invention discloses a device and a method for calculating tiles in an electronic map visual area. The method includes: converting to obtain the pixel coordinates of a central point according the geographic position coordinates of the central point of the map visual area and the current map display level; obtaining the pixel size of a signal tile at the current display level according to the current map display level; obtaining the pixel coordinates of two opposite peaks of the map visual area according to the pixel size of the map visual area and the pixel coordinates of the central point; obtaining the number of the tile in the visual area according to the pixel coordinates of the two opposite peaks of the map visual area and the pixel size of the signal tile at the current display level. The method has the advantages that the number of the tile in the visual area is obtained by calculation according to the geographic position coordinates and the display level, the number of the tile in the visual area can be calculated accurately, and the problem that tile acquisition is poor in accuracy and speed is solved.
Description
Technical field
The present invention relates to electronic map technique field, be specifically related to a kind of method of calculating the device of the tile in electronic chart viewing area and calculating the tile in electronic chart viewing area.
Background technology
In the application of current electronic chart, the concrete preservation form of preserving tile by server end is tile to be take to pixel coordinate preserve as index.The method of the tile in client-requested electronic chart viewing area is by using pixel coordinate to send to server end the tile request of downloading, by server end, according to pixel coordinate, obtain tile and tile is returned to client, yet adopt such method, not only the treatment capacity of server is larger, and tile to obtain accuracy rate and the operating speed of operation not good.
Summary of the invention
In view of the above problems, the present invention has been proposed to device and the corresponding method of calculating the tile in electronic chart viewing area of the tile in a kind of calculating electronic chart viewing area that overcomes the problems referred to above or address the above problem are at least in part provided.
According to one aspect of the present invention, a kind of device that calculates the tile in electronic chart viewing area is provided, this device comprises: fixed-point arithmetic unit, be suitable for the geographical position coordinates of the central point of viewing area and the current display level of map according to the map, convert and obtain the pixel coordinate of central point; Tile analytic unit, is suitable for current display level according to the map, obtains the Pixel Dimensions of the single tile of current display level; Summit analytic unit, is suitable for the Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtains the pixel coordinate on two relative summits of map viewing area; Tile arithmetic element, is suitable for the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of the single tile of current display level according to the map and obtains the tile numbering in viewing area.
Alternatively, described summit analytic unit, is suitable for obtaining horizontal index number and the longitudinal index number of the tile at two relative places, summit; Choose the longitudinal index number between the horizontal index number between the horizontal index number of the tile at two relative places, summit and the longitudinal index number at the tile at two relative places, summit, obtain the tile numbering in map viewing area; Wherein, described tile arithmetic element, the pixel coordinate that is suitable for described summit to utilize respectively the pixel coordinate on summit to deduct the initial point of map obtains the difference of horizontal ordinate and the difference of ordinate, the difference of utilizing horizontal ordinate obtains horizontal index number divided by the pixel wide of single tile, the difference of utilizing ordinate obtains longitudinal index number divided by the pixels tall of single tile, thereby obtains horizontal index number and the longitudinal index number of the tile at two relative places, summit.
Alternatively, this device also comprises: prestrain tile arithmetic element, is suitable for geographical position coordinates and the prestrain rank of the central point of viewing area according to the map and is calculated to the numbering of lacking prestrain tile corresponding with viewing area in a prestrain rank; Or, be suitable for carrying out division rounding operation or multiplying according to the poor tile numbering by map viewing area under current display level of the rank between prestrain rank and current display level, calculate at least one prestrain rank the numbering of the prestrain tile corresponding with tile in viewing area; Wherein, described prestrain rank, is at least one rank in the poor scope arranging of the rank with current display level.
Alternatively, described prestrain tile arithmetic element is suitable for geographical position coordinates and the prestrain rank of the central point of viewing area according to the map, converts and obtains the pixel coordinate of central point; Prestrain rank according to the map, obtains the Pixel Dimensions of other single tile of pre-load stage; The Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtain the pixel coordinate on two relative summits of map viewing area; And the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of other single tile of pre-load stage obtain the numbering of prestrain tile corresponding with viewing area in prestrain rank according to the map.
Alternatively, if prestrain rank higher than current display level, described prestrain tile arithmetic element be suitable for by the horizontal index number of the tile in map viewing area under current display level and longitudinally index number respectively divided by m and round, wherein, m=2
k, k is natural number, represents that the rank between prestrain rank and current display level is poor; If prestrain rank is lower than current display level, described prestrain tile arithmetic element is suitable for the horizontal index number of the tile in map viewing area under current display level and longitudinal index number to take advantage of respectively p and obtain p adjacent index number according to multiplication result, wherein, p=2
q, q is natural number, represents that the rank between current display level and prestrain rank is poor.
Alternatively, two relative summits of described map viewing area comprise: the left upper apex of map viewing area and summit, bottom right, or, the summit, upper right of map viewing area and summit, lower-left.
Alternatively, described fixed-point arithmetic unit, is further adapted for when receiving the instruction of convergent-divergent map, and the target display level after the geographical position coordinates of convergent-divergent focus center according to the map and map convergent-divergent converts and obtains the pixel coordinate of convergent-divergent focus center; Described tile analytic unit, is further adapted for according to target display level, obtains the Pixel Dimensions of the single tile under target display level; Described summit analytic unit, is further adapted for the Pixel Dimensions of viewing area and the pixel coordinate of convergent-divergent focus center according to the map, obtains the pixel coordinate on two relative summits of map convergent-divergent viewing area afterwards; Described tile arithmetic element, further the pixel coordinate on two relative summits of the viewing area after suitable convergent-divergent according to the map and the Pixel Dimensions of the single tile under target display level obtain the numbering of the tile in map convergent-divergent viewing area afterwards.
According to a further aspect in the invention, a kind of method of calculating the tile in electronic chart viewing area is provided, the method comprises: the current display level of the geographical position coordinates of the central point of viewing area and map according to the map, converts and obtains the pixel coordinate of central point; Current display level according to the map, obtains the Pixel Dimensions of the single tile of current display level; The Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtain the pixel coordinate on two relative summits of map viewing area; And the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of the single tile of current display level obtain the tile numbering in viewing area according to the map.
Alternatively, the Pixel Dimensions of the pixel coordinate on two relative summits of described viewing area according to the map and the single tile that needs to show obtains the tile numbering in map viewing area, comprising: the horizontal index number and the longitudinal index number that obtain the tile at two relative places, summit; And choose the longitudinal index number between the horizontal index number between the horizontal index number of the tile at two relative places, summit and the longitudinal index number at the tile at two relative places, summit, obtain the tile numbering in map viewing area; Wherein, described horizontal index number and the longitudinal index number that obtains the tile at two relative places, summit, specifically comprise: the pixel coordinate that utilizes respectively the pixel coordinate on summit to deduct the initial point of map to described summit obtains the difference of horizontal ordinate and the difference of ordinate, the difference of utilizing horizontal ordinate obtains horizontal index number divided by the pixel wide of single tile, and the difference of utilizing ordinate obtains longitudinal index number divided by the pixels tall of single tile.
Alternatively, the method also comprises: the geographical position coordinates of the central point of viewing area and prestrain rank are calculated to the numbering of prestrain tile corresponding with viewing area in a few prestrain rank according to the map; Or carry out division rounding operation or multiplying according to the poor tile numbering by map viewing area under current display level of the rank between prestrain rank and current display level, calculate at least one prestrain rank the numbering of the prestrain tile corresponding with tile in viewing area; Wherein, described prestrain rank, is at least one rank in the poor scope arranging of the rank with current display level.
Alternatively, the geographical position coordinates of the central point of described viewing area according to the map and prestrain rank are calculated to the numbering of prestrain tile corresponding with viewing area in a few prestrain rank, specifically comprise: the geographical position coordinates of the central point of viewing area and prestrain rank according to the map, convert and obtain the pixel coordinate of central point; Prestrain rank according to the map, obtains the Pixel Dimensions of other single tile of pre-load stage; The Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtain the pixel coordinate on two relative summits of map viewing area; And the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of other single tile of pre-load stage obtain the numbering of prestrain tile corresponding with viewing area in prestrain rank according to the map.
Alternatively, describedly according to the rank between prestrain rank and current display level is poor, the numbering of the tile in map viewing area under current display level is carried out to division rounding operation or multiplying, comprise: if prestrain rank is higher than current display level, by the horizontal index number of the tile in map viewing area under current display level and longitudinally index number respectively divided by m and round, wherein, m=2
k, k is natural number, represents that the rank between prestrain rank and current display level is poor; If prestrain rank, lower than current display level, is taken advantage of the horizontal index number of the tile in map viewing area under current display level and longitudinal index number respectively p and is obtained p adjacent index number according to multiplication result, wherein, p=2
q, q is natural number, represents that the rank between current display level and prestrain rank is poor.
Alternatively, two relative summits of described map viewing area comprise: the left upper apex of map viewing area and summit, bottom right, or, the summit, upper right of map viewing area and summit, lower-left.
Alternatively, the method also comprises: when receiving the instruction of convergent-divergent map, the target display level after the geographical position coordinates of convergent-divergent focus center according to the map and map convergent-divergent, converts and obtain the pixel coordinate of convergent-divergent focus center; According to target display level, obtain the Pixel Dimensions of the single tile under target display level; The pixel coordinate of the Pixel Dimensions of viewing area and convergent-divergent focus center according to the map, obtains the pixel coordinate on two relative summits of the viewing area after map convergent-divergent; And the pixel coordinate on two relative summits of the viewing area after convergent-divergent and the Pixel Dimensions of the single tile under target display level obtain the numbering of the tile in the viewing area after map convergent-divergent according to the map.
According to the method for the tile in the device of the tile in calculating electronic chart of the present invention viewing area and calculating electronic chart viewing area, by geographical position coordinates and display level, calculate the numbering of the tile in viewing area, calculate exactly thus the numbering of the tile in viewing area, solved tile and obtained accuracy rate and the not good problem of operating speed of operation.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by the specific embodiment of the present invention.
Accompanying drawing explanation
By reading below detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing is only for the object of preferred implementation is shown, and do not think limitation of the present invention.And in whole accompanying drawing, by identical reference symbol, represent identical parts.In the accompanying drawings:
Fig. 1 shows according to the process flow diagram of the method for the tile in the calculating electronic chart viewing area of first embodiment of the invention;
Fig. 2 shows the detailed process flow diagram of step S400 in Fig. 1;
Fig. 3 shows according to the process flow diagram of the method for the tile in the calculating electronic chart viewing area of second embodiment of the invention;
Fig. 4 shows the detailed process flow diagram of step S500 ' in Fig. 3;
Fig. 5 shows according to the process flow diagram of the method for the tile in the calculating electronic chart viewing area of third embodiment of the invention;
Fig. 6 shows according to the block diagram of the device of the tile in the calculating electronic chart viewing area of first embodiment of the invention;
Fig. 7 shows according to the block diagram of the method for the tile in the calculating electronic chart viewing area of second embodiment of the invention; And
Fig. 8 shows according to the present invention and the schematic diagram of the electronic chart client that realizes.
Embodiment
Exemplary embodiment of the present disclosure is described below with reference to accompanying drawings in more detail.Although shown exemplary embodiment of the present disclosure in accompanying drawing, yet should be appreciated that and can realize the disclosure and the embodiment that should do not set forth limits here with various forms.On the contrary, it is in order more thoroughly to understand the disclosure that these embodiment are provided, and can by the scope of the present disclosure complete convey to those skilled in the art.
It should be noted that, electronic chart tile, it is the picture in grating map, these pictures are by certain rule, be spliced into a complete electronic chart, electronic chart is amplified and (consults Baidu's map, the electronic chart networking clients such as Tengxun's map, clicking large buttons is the "+" button, in known electronic map technique field, to be illustrated in the geographic range showing in identical electronic chart indication range little for enlarged map, geographical details is more detailed), can show more low-level tile, in this area, the represented body of a map or chart of the represented more low-level single tile of body of a map or chart of the single tile of higher level is large, for example, a tile of higher level in adjacent rank (for example the 16th grade) is for example equivalent to, compared with four represented body of a map or charts of tile of low level (the 17th grade), rank is poor is in two ranks of 2, a tile of higher level (for example the 16th grade) is for example equivalent to, compared with 16 represented body of a map or charts of tile of low level (the 18th grade).
Fig. 1 shows according to the process flow diagram of the method for the tile in the calculating electronic chart viewing area of first embodiment of the invention.The method comprises that step S100 as described below is to step S400:
S100, the geographical position coordinates of the central point of viewing area and the current display level of map according to the map, convert and obtain the pixel coordinate of central point.In the present embodiment, the geographical position coordinates of the central point of map viewing area is latitude and longitude coordinates or latitude and longitude coordinates is projected to the coordinate obtaining on plane map through projection algorithm, by the current display level of geographical position coordinates and map, can convert and obtain the pixel coordinate (for example X-Y coordinate) of central point.
S200, current display level according to the map, obtain the Pixel Dimensions of the single tile of current display level.
Preferably, in the present embodiment, in order to represent all sidedly more in detail the information on map, the preservation of electronic chart adopts classification tile mechanism, map is divided into a plurality of levels to be preserved, under each level, deposit corresponding grating map tile, the tile of take under two adjacent display levels is example, and four adjacent tiles (i.e. four adjacent tiles that are sphere of movements for the elephants shape of 2 * 2) under the low display level of display level are corresponding to a tile under the high display level of display level; The poor two layers of tiles as 2 of the rank of take is example, and 16 adjacent tiles (i.e. 4 * 4 16 adjacent tiles) under the low display level of display level are corresponding to a tile under the high display level of display level.Therefore, the Pixel Dimensions of the single tile under different stage is different, and current display level according to the map can access the Pixel Dimensions of the single tile of current display level, for example pixel wide and pixels tall.
S300, the Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtain the pixel coordinate on two relative summits of map viewing area.In the present embodiment, suppose that map viewing area is square and Pixel Dimensions is fixed, certainly, even if the Pixel Dimensions of viewing area is variable, those skilled in the art also can detect the Pixel Dimensions that obtains viewing area.In the present embodiment, two relative summits of map viewing area comprise left upper apex and the summit, bottom right of map viewing area, or the summit, upper right of map viewing area and summit, lower-left, by two relative summits, can determine uniquely the scope of map viewing area.
S400, the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of the single tile of current display level obtain the tile numbering in viewing area according to the map.
According to projection theory, in two maps before and after convergent-divergent, there is overlapping point to represent identical geographic position, the present embodiment is defined as convergent-divergent focus center by the represented constant point in geographic position before and after map convergent-divergent, according to the target display level after the geographical position coordinates of convergent-divergent focus center (being latitude and longitude coordinates) and map convergent-divergent, can access the pixel coordinate (for example, X-Y coordinate) of convergent-divergent focus center.The convergent-divergent focus center of the present embodiment, when receiving the convergent-divergent map instruction that user inputs by mouse roller, can be the position of mouse, or can be the center of map when receiving the convergent-divergent map instruction of user by page button (as "+", "-" number button) input.Based on convergent-divergent focus center, calculate the numbering of the tile in map convergent-divergent viewing area afterwards, can simplify calculation process and reduce calculated amount.
Therefore, the method of the present embodiment is further comprising the steps of, with when receiving the convergent-divergent map instruction of user's input, calculate the numbering of the tile in map convergent-divergent viewing area afterwards: when receiving the instruction of convergent-divergent map, target display level after the geographical position coordinates of convergent-divergent focus center according to the map and map convergent-divergent, converts and obtains the pixel coordinate of convergent-divergent focus center; According to target display level, obtain the Pixel Dimensions of the single tile under target display level; The pixel coordinate of the Pixel Dimensions of viewing area and convergent-divergent focus center according to the map, obtains the pixel coordinate on two relative summits of the viewing area after map convergent-divergent; And the pixel coordinate on two relative summits of the viewing area after convergent-divergent and the Pixel Dimensions of the single tile under target display level obtain the numbering of the tile in the viewing area after map convergent-divergent according to the map.
Fig. 2 shows the detailed process flow diagram of step S400 in Fig. 1.Comprise step S410 as described below and step S420:
S410, obtain horizontal index number and the longitudinal index number of the tile at two relative places, summit.Specifically to described two relative summits, utilize respectively the pixel coordinate on summit to deduct the pixel coordinate of the initial point of map, obtain the difference of horizontal ordinate (for example, the X coordinate of X-Y coordinate system) and the difference of ordinate (for example, the Y coordinate of X-Y coordinate system); The difference of utilizing further horizontal ordinate obtains horizontal index number divided by the pixel wide of single tile, and the difference of utilizing ordinate obtains longitudinal index number divided by the pixels tall of single tile.
S420, choose the longitudinal index number (the longitudinal index number that comprises the tile at two relative places, summit) between the horizontal index number (the horizontal index number that comprises the tile at two relative places, summit) between the horizontal index number of the tile at two relative places, summit and the longitudinal index number at the tile at two relative places, summit, obtain the tile numbering in map viewing area.By step S420, obtain the numbering of the tile in square viewing area.
Fig. 3 shows according to the process flow diagram of the method for the tile in the calculating electronic chart viewing area of second embodiment of the invention.The second embodiment comprises that step S100 ' is to step S500 ', and wherein step S100 ' is identical to step S400 with the step S100 of the first embodiment respectively to step S400 ', repeats no more.
Step S500 ' is: the geographical position coordinates of the central point of viewing area and prestrain rank are calculated to the numbering of prestrain tile corresponding with viewing area in a few prestrain rank according to the map.Prestrain rank is at least one rank in the poor scope arranging of the rank with current display level, for example, suppose that current display level is the 10th grade, if the scope arranging be higher maximum 3 grades and lower maximum 2 grades than current display level than current display level, prestrain rank comprises than the 10th grade high the 9th grade, the 8th grade and the 7th grade and compares the 10th grade low the 11st grade and the 12nd grade.
Fig. 4 shows the detailed process flow diagram of step S500 ' in Fig. 3.Step S500 ' comprises that step S510 ' as described below is to step S540 ':
S510 ', geographical position coordinates and the prestrain rank of the central point of viewing area according to the map, convert and obtain the pixel coordinate of central point.In the present embodiment, the geographical position coordinates of the central point of map viewing area is latitude and longitude coordinates or latitude and longitude coordinates is projected to the coordinate obtaining on plane map through projection algorithm, by geographical position coordinates and prestrain rank, can convert and obtain the pixel coordinate (for example X-Y coordinate) of the central point under prestrain display level.
S520 ', prestrain rank according to the map, obtain the Pixel Dimensions of other single tile of pre-load stage.Prestrain rank according to the map, can access the Pixel Dimensions of other single tile of pre-load stage, for example pixel wide and pixels tall.
S530 ', the Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtain the pixel coordinate on two relative summits of map viewing area.Two relative summits of map viewing area comprise left upper apex and the summit, bottom right of map viewing area, or the summit, upper right of map viewing area and summit, lower-left, by two relative summits, can determine uniquely the scope of map viewing area.
S540 ', the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of other single tile of pre-load stage obtain the numbering of prestrain tile corresponding with viewing area in prestrain rank according to the map.Concrete grammar and the step S410 shown in Fig. 2, the S420 of performing step S540 ' are similar, repeat no more.
Further, above-mentioned steps S500 ', also comprises according to the numbering of the prestrain tile obtaining, and obtains the operation of the numbering of the tile of prestrain tile periphery under prestrain rank.Specifically the horizontal index number obtaining and longitudinal index number are carried out to suitable expansion.
Fig. 5 shows according to the process flow diagram of the method for the tile in the calculating electronic chart viewing area of third embodiment of the invention.The 3rd embodiment comprises that step S100 ' ' is to step S500 ' ', and wherein step S100 ' ' is identical to step S400 with the step S100 of the first embodiment respectively to step S400 ' ', repeats no more.
Step S500 ' ' is: according to the poor tile numbering by map viewing area under current display level of the rank between prestrain rank and current display level, carry out division rounding operation or multiplying, calculate at least one prestrain rank the numbering of the prestrain tile corresponding with tile in viewing area.Prestrain rank is at least one rank in the poor scope arranging of the rank with current display level.
Particularly, the rank according between prestrain rank and current display level in step S500 ' ' is poor carries out division rounding operation by the tile numbering in map viewing area under current display level or multiplying comprises: if prestrain rank higher than current display level, by the horizontal index number of the tile in map viewing area under current display level and longitudinally index number respectively divided by m and round.Those skilled in the art can be appreciated that, the concrete algorithm that rounds, can select according to the index number of tile cutting initial point, if the index number of tile cutting initial point is zero, round downwards and get final product (similar floor function), otherwise round up (similar ceiling function).Wherein, m=2
k, k is natural number, represents that the rank between prestrain rank and current display level is poor.If prestrain rank is lower than current display level, the horizontal index number of the tile in map viewing area under current display level and longitudinal index number are taken advantage of respectively to p and obtained p adjacent index number according to multiplication result, concrete grammar is with above-mentioned to round algorithm corresponding, wherein, p=2
q, q is natural number, represents that the rank between current display level and prestrain rank is poor.Compare with the step S500 ' of the second embodiment, the step S500 ' ' of the 3rd embodiment reduces computational complexity when guaranteeing accuracy rate.
Further, above-mentioned steps S500 ' ', also comprises according to the numbering of the prestrain tile obtaining, and obtains the operation of the numbering of the tile of prestrain tile periphery under prestrain rank.Specifically the horizontal index number obtaining and longitudinal index number are carried out to suitable expansion.
It should be noted that, if prestrain rank higher than current display level, the corresponding geographic areas of each prestrain tile be greater than the corresponding geographic areas of each target tile and for the n of the corresponding geographic areas of each target tile doubly, n=4
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.If prestrain rank is lower than current display level, the corresponding geographic areas of each prestrain tile is less than the corresponding geographic areas of each target tile and is the 1/r of the corresponding geographic areas of each target tile, wherein, and r=4
q, q is natural number, represents that the rank between current display level and prestrain rank is poor.
Further, operation below in conjunction with electronic chart loaded and displayed, the technique effect that the step S500 ' of second embodiment of the invention and the step S500 ' ' of the 3rd embodiment realize by calculating the numbering of prestrain tile is described, while specifically reducing electronic chart client convergent-divergent or translation electronic chart there is the technique effect of blank probability in electronic display window.
If analytical electron map client loads the quantity of request and the relation of time of tile in one section of sufficiently long time range, tend to find, few (the free time section of the request quantity that loads tile within some time periods, idle-time partition), and the request quantity that loads tile within compared with shorter time periods is many, by calculating the numbering of prestrain tile, electronic chart client is called the above-mentioned part or all of prestrain tile of idle thread prestrain in section between can be at one's leisure.
Further, electronic chart client is during in the mutual indication of the electronic chart that receives user input and for mutual indication convergent-divergent or translation electronic chart, by calculated response, complete for example, target display level (if map translation after (completing map amplifieroperation), target display level is current display level), load and play up the target tile under display-object display level.If there is the above-mentioned prestrain tile having loaded in the set that target tile forms, Whole Response speed is improved.
Further, can calculate the fuzzy rank higher than target display level, choose fuzzy tile corresponding with target tile in fuzzy rank, fuzzy tile is shown enlargedly and obtains the map that sharpness is lower, obtain after target rank tile, load and show that described target rank tile obtains map clearly to replace the fuzzy tile of amplification of correspondence position.Because the overall quantity of fuzzy tile is less than the overall quantity of described target tile, so response speed is faster.If there is the above-mentioned prestrain tile having loaded in the set that fuzzy tile forms, Whole Response speed is able to further raising, and those skilled in the art easily understand, and when map amplification or translation, uses the probability of above-mentioned prestrain tile higher.When therefore, the step S500 ' ' of the step S500 ' of second embodiment of the invention and the 3rd embodiment reduces electronic chart client convergent-divergent or translation electronic chart by calculating the numbering of prestrain tile there is blank probability in electronic display window.
Fig. 6 shows according to the block diagram of the device of the tile in the calculating electronic chart viewing area of first embodiment of the invention.This device comprises fixed-point arithmetic unit 100, tile analytic unit 200, summit analytic unit 400 and tile arithmetic element 400.
Fixed-point arithmetic unit 100, is suitable for the geographical position coordinates of the central point of viewing area and the current display level of map according to the map, converts and obtains the pixel coordinate of central point.In the present embodiment, the geographical position coordinates of the central point of map viewing area is latitude and longitude coordinates or latitude and longitude coordinates is projected to the coordinate on plane map through projection algorithm, fixed-point arithmetic unit 100, by the current display level of geographical position coordinates and map, can convert and obtain the pixel coordinate (for example X-Y coordinate) of central point.
Tile analytic unit 200, is suitable for current display level according to the map, obtains the Pixel Dimensions of the single tile of current display level.In the present embodiment, the Pixel Dimensions of the single tile under different stage is different, and tile analytic unit 200 current display level according to the map can access the Pixel Dimensions of the single tile of current display level, for example pixel wide and pixels tall.
Summit analytic unit 300, is suitable for the Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtains the pixel coordinate on two relative summits of map viewing area.Two relative summits of the map viewing area of the present embodiment comprise: the left upper apex of map viewing area and summit, bottom right, or, the summit, upper right of map viewing area and summit, lower-left, can determine the scope of map viewing area uniquely by two relative summits.
Tile arithmetic element 400, is suitable for the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of the single tile of current display level according to the map and obtains the tile numbering in viewing area.
The summit analytic unit 300 of the present embodiment, is suitable for obtaining horizontal index number and the longitudinal index number of the tile at two relative places, summit; Tile arithmetic element 400, be suitable for choosing the longitudinal index number between the horizontal index number between the horizontal index number of the tile at two relative places, summit and the longitudinal index number at the tile at two relative places, summit, obtain the tile numbering in map viewing area.
More specifically, summit analytic unit 300, the pixel coordinate that is suitable for described summit to utilize respectively the pixel coordinate on summit to deduct the initial point of map (for example obtains horizontal ordinate, the X coordinate of X-Y coordinate system) difference and ordinate are (for example, the Y coordinate of X-Y coordinate system) difference, the difference of utilizing horizontal ordinate obtains horizontal index number divided by the pixel wide of single tile, the difference of utilizing ordinate obtains longitudinal index number divided by the pixels tall of single tile, thereby obtains horizontal index number and the longitudinal index number of the tile at two relative places, summit.
According to projection theory, in two maps before and after convergent-divergent, there is overlapping point to represent identical geographic position, the convergent-divergent focus center of the present embodiment is the constant point in geographic position represented before and after map convergent-divergent, fixed-point arithmetic unit 100 is according to the target display level after the geographical position coordinates of convergent-divergent focus center (being latitude and longitude coordinates) and map convergent-divergent, can access the pixel coordinate (for example, X-Y coordinate) of convergent-divergent focus center.Based on convergent-divergent focus center, calculate the numbering of the tile in map convergent-divergent viewing area afterwards, can simplify calculation process and reduce calculated amount.
So in the present embodiment, fixed-point arithmetic unit 100, be further adapted for when receiving the instruction of convergent-divergent map, the target display level after the geographical position coordinates of convergent-divergent focus center according to the map and map convergent-divergent, converts and obtains the pixel coordinate of convergent-divergent focus center.Tile analytic unit 200, is further adapted for according to target display level, obtains the Pixel Dimensions of the single tile under target display level.Summit analytic unit 300, is further adapted for the Pixel Dimensions of viewing area and the pixel coordinate of convergent-divergent focus center according to the map, obtains the pixel coordinate on two relative summits of map convergent-divergent viewing area afterwards.Tile arithmetic element 400, further the pixel coordinate on two relative summits of the viewing area after suitable convergent-divergent according to the map and the Pixel Dimensions of the single tile under target display level obtain the numbering of the tile in map convergent-divergent viewing area afterwards.
Fig. 7 shows according to the block diagram of the method for the tile in the calculating electronic chart viewing area of second embodiment of the invention.Second embodiment of the invention and above-mentioned the first embodiment are roughly the same, and difference is also to comprise prestrain tile computing unit 500.
Prestrain tile arithmetic element 500, is suitable for calculating the numbering of the prestrain tile in prestrain rank, and wherein prestrain rank is at least one rank in the poor scope arranging of the rank with current display level.There are two kinds of embodiments in the prestrain tile arithmetic element 500 of the present embodiment, the first embodiment is the geographical position coordinates of the central point of viewing area according to the map and the numbering that prestrain rank is calculated to prestrain tile corresponding with map viewing area in a few prestrain rank.Particularly, prestrain tile arithmetic element 500 is geographical position coordinates and the prestrain rank of the central point of viewing area according to the map, converts and obtains the pixel coordinate of central point; Prestrain rank according to the map, obtains the Pixel Dimensions of other single tile of pre-load stage; The Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtain the pixel coordinate on two relative summits of map viewing area; And the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of other single tile of pre-load stage obtain the numbering of prestrain tile corresponding with viewing area in prestrain rank according to the map.
Two relative summits of described map viewing area comprise: the left upper apex of map viewing area and summit, bottom right, or, the summit, upper right of map viewing area and summit, lower-left, can determine the scope of map viewing area uniquely by two relative summits.
The second embodiment of the prestrain tile arithmetic element 500 of the present embodiment is to carry out division rounding operation or multiplying according to the poor tile numbering by map viewing area under current display level of the rank between prestrain rank and current display level, calculates at least one prestrain rank the numbering of the prestrain tile corresponding with tile in viewing area.Particularly, if prestrain rank higher than current display level, prestrain tile arithmetic element 500 be suitable for by the horizontal index number of the tile in map viewing area under current display level and longitudinally index number respectively divided by m and round, wherein, m=2
k, k is natural number, represents that the rank between prestrain rank and current display level is poor; If prestrain rank is lower than current display level, prestrain tile arithmetic element 500 is suitable for the horizontal index number of the tile in map viewing area under current display level and longitudinal index number to take advantage of respectively p and obtain p adjacent index number according to multiplication result, wherein, p=2
q, q is natural number, represents that the rank between current display level and prestrain rank is poor.
Further, above-mentioned prestrain tile arithmetic element 500, further according to the numbering of the prestrain tile obtaining, obtains the numbering of the tile of prestrain tile periphery under prestrain rank.Specifically the horizontal index number obtaining and longitudinal index number are carried out to suitable expansion.
Fig. 8 shows according to the present invention and the schematic diagram of the electronic chart client that realizes.Device by the tile in calculating electronic chart of the present invention viewing area and calculate the method for the tile in electronic chart viewing area, it is better that electronic chart client is obtained the accuracy rate of tile, the speed of obtaining tile is faster, and the response speed of picture being carried out to zooming and panning operation is faster.
It should be noted that:
The algorithm providing at this is intrinsic not relevant to any certain computer, virtual system or miscellaneous equipment with demonstration.Various general-purpose systems also can with based on using together with this teaching.According to description above, it is apparent constructing the desired structure of this type systematic.In addition, the present invention is not also for any certain programmed language.It should be understood that and can utilize various programming languages to realize content of the present invention described here, and the description of above language-specific being done is in order to disclose preferred forms of the present invention.
In the instructions that provided herein, a large amount of details have been described.Yet, can understand, embodiments of the invention can not put into practice in the situation that there is no these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Similarly, be to be understood that, in order to simplify the disclosure and to help to understand one or more in each inventive aspect, in the above in the description of exemplary embodiment of the present invention, each feature of the present invention is grouped together into single embodiment, figure or sometimes in its description.Yet, the method for the disclosure should be construed to the following intention of reflection: the present invention for required protection requires than the more feature of feature of clearly recording in each claim.Or rather, as reflected in claims below, inventive aspect is to be less than all features of disclosed single embodiment above.Therefore, claims of following embodiment are incorporated to this embodiment thus clearly, and wherein each claim itself is as independent embodiment of the present invention.
Those skilled in the art are appreciated that and can the module in the equipment in embodiment are adaptively changed and they are arranged in one or more equipment different from this embodiment.Module in embodiment or unit or assembly can be combined into a module or unit or assembly, and can put them into a plurality of submodules or subelement or sub-component in addition.At least some in such feature and/or process or unit are mutually repelling, and can adopt any combination to combine all processes or the unit of disclosed all features in this instructions (comprising claim, summary and the accompanying drawing followed) and disclosed any method like this or equipment.Unless clearly statement in addition, in this instructions (comprising claim, summary and the accompanying drawing followed) disclosed each feature can be by providing identical, be equal to or the alternative features of similar object replaces.
In addition, those skilled in the art can understand, although embodiment more described herein comprise some feature rather than further feature included in other embodiment, the combination of the feature of different embodiment means within scope of the present invention and forms different embodiment.For example, in the following claims, the one of any of embodiment required for protection can be used with array mode arbitrarily.
All parts embodiment of the present invention can realize with hardware, or realizes with the software module moved on one or more processor, or realizes with their combination.It will be understood by those of skill in the art that and can use in practice microprocessor or digital signal processor (DSP) to realize according to the some or all functions of the some or all parts in the equipment of the tile in the calculating electronic chart viewing area of the embodiment of the present invention.The present invention for example can also be embodied as, for carrying out part or all equipment or device program (, computer program and computer program) of method as described herein.Realizing program of the present invention and can be stored on computer-readable medium like this, or can there is the form of one or more signal.Such signal can be downloaded and obtain from internet website, or provides on carrier signal, or provides with any other form.
It should be noted above-described embodiment the present invention will be described rather than limit the invention, and those skilled in the art can design alternative embodiment in the situation that do not depart from the scope of claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and is not listed as element or step in the claims.Being positioned at word " " before element or " one " does not get rid of and has a plurality of such elements.The present invention can be by means of including the hardware of some different elements and realizing by means of the computing machine of suitably programming.In having enumerated the unit claim of some devices, several in these devices can be to carry out imbody by same hardware branch.The use of word first, second and C grade does not represent any order.Can be title by these word explanations.
Claims (10)
1. calculate a device for the tile in electronic chart viewing area, this device comprises:
Fixed-point arithmetic unit, is suitable for the geographical position coordinates of the central point of viewing area and the current display level of map according to the map, converts and obtains the pixel coordinate of central point;
Tile analytic unit, is suitable for current display level according to the map, obtains the Pixel Dimensions of the single tile of current display level;
Summit analytic unit, is suitable for the Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtains the pixel coordinate on two relative summits of map viewing area;
Tile arithmetic element, is suitable for the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of the single tile of current display level according to the map and obtains the tile numbering in viewing area.
2. device according to claim 1, wherein, two relative summits of described map viewing area comprise: the left upper apex of map viewing area and summit, bottom right, or, the summit, upper right of map viewing area and summit, lower-left.
3. device according to claim 1 and 2, wherein,
Described fixed-point arithmetic unit, is further adapted for when receiving the instruction of convergent-divergent map, and the target display level after the geographical position coordinates of convergent-divergent focus center according to the map and map convergent-divergent converts and obtains the pixel coordinate of convergent-divergent focus center;
Described tile analytic unit, is further adapted for according to target display level, obtains the Pixel Dimensions of the single tile under target display level;
Described summit analytic unit, is further adapted for the Pixel Dimensions of viewing area and the pixel coordinate of convergent-divergent focus center according to the map, obtains the pixel coordinate on two relative summits of map convergent-divergent viewing area afterwards;
Described tile arithmetic element, further the pixel coordinate on two relative summits of the viewing area after suitable convergent-divergent according to the map and the Pixel Dimensions of the single tile under target display level obtain the numbering of the tile in map convergent-divergent viewing area afterwards.
4. a method of calculating the tile in electronic chart viewing area, the method comprises:
The current display level of the geographical position coordinates of the central point of viewing area and map, converts and obtains the pixel coordinate of central point according to the map;
Current display level according to the map, obtains the Pixel Dimensions of the single tile of current display level;
The Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtain the pixel coordinate on two relative summits of map viewing area; And
The Pixel Dimensions of two of viewing area pixel coordinates on relative summit and the single tile of current display level obtains the tile numbering in viewing area according to the map.
5. method according to claim 4, wherein, the Pixel Dimensions of the single tile that the pixel coordinate on two relative summits of described viewing area according to the map and needing shows obtains the tile numbering in map viewing area, comprising:
Obtain horizontal index number and longitudinal index number of the tile at two relative places, summit; And
Choose the longitudinal index number between the horizontal index number between the horizontal index number of the tile at two relative places, summit and the longitudinal index number at the tile at two relative places, summit, obtain the tile numbering in map viewing area;
Wherein, described horizontal index number and the longitudinal index number that obtains the tile at two relative places, summit, specifically comprise: the pixel coordinate that utilizes respectively the pixel coordinate on summit to deduct the initial point of map to described summit obtains the difference of horizontal ordinate and the difference of ordinate, the difference of utilizing horizontal ordinate obtains horizontal index number divided by the pixel wide of single tile, and the difference of utilizing ordinate obtains longitudinal index number divided by the pixels tall of single tile.
6. according to the method described in claim 4 or 5, wherein, the method also comprises:
The geographical position coordinates of the central point of viewing area and prestrain rank are calculated to the numbering of prestrain tile corresponding with viewing area in a few prestrain rank according to the map; Or carry out division rounding operation or multiplying according to the poor tile numbering by map viewing area under current display level of the rank between prestrain rank and current display level, calculate at least one prestrain rank the numbering of the prestrain tile corresponding with tile in viewing area; Wherein, described prestrain rank, is at least one rank in the poor scope arranging of the rank with current display level.
7. according to the method described in claim 4-6 any one, wherein, the geographical position coordinates of the central point of described viewing area according to the map and prestrain rank are calculated to the numbering of prestrain tile corresponding with viewing area in a few prestrain rank, specifically comprise:
The geographical position coordinates of the central point of viewing area and prestrain rank, convert and obtain the pixel coordinate of central point according to the map;
Prestrain rank according to the map, obtains the Pixel Dimensions of other single tile of pre-load stage;
The Pixel Dimensions of viewing area and the pixel coordinate of central point according to the map, obtain the pixel coordinate on two relative summits of map viewing area; And
The pixel coordinate on two of viewing area relative summits and the Pixel Dimensions of other single tile of pre-load stage obtain the numbering of prestrain tile corresponding with viewing area in prestrain rank according to the map.
8. according to the method described in claim 4-7 any one, wherein, describedly according to the rank between prestrain rank and current display level is poor, the numbering of the tile in map viewing area under current display level is carried out to division rounding operation or multiplying, comprising:
If prestrain rank is higher than current display level, by the horizontal index number of the tile in map viewing area under current display level and longitudinally index number respectively divided by m and round, wherein, m=2
k, k is natural number, represents that the rank between prestrain rank and current display level is poor;
If prestrain rank, lower than current display level, is taken advantage of the horizontal index number of the tile in map viewing area under current display level and longitudinal index number respectively p and is obtained p adjacent index number according to multiplication result, wherein, p=2
q, q is natural number, represents that the rank between current display level and prestrain rank is poor.
9. according to the method described in claim 4-8 any one, wherein, two relative summits of described map viewing area comprise: the left upper apex of map viewing area and summit, bottom right, or, the summit, upper right of map viewing area and summit, lower-left.
10. according to the method described in claim 4-9 any one, wherein, the method also comprises:
When receiving the instruction of convergent-divergent map, the target display level after the geographical position coordinates of convergent-divergent focus center according to the map and map convergent-divergent, converts and obtains the pixel coordinate of convergent-divergent focus center;
According to target display level, obtain the Pixel Dimensions of the single tile under target display level;
The pixel coordinate of the Pixel Dimensions of viewing area and convergent-divergent focus center according to the map, obtains the pixel coordinate on two relative summits of the viewing area after map convergent-divergent; And
The pixel coordinate on two relative summits of the viewing area after convergent-divergent and the Pixel Dimensions of the single tile under target display level obtain the numbering of the tile in map convergent-divergent viewing area afterwards according to the map.
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| CN201310744408.5A CN103699439B (en) | 2013-12-30 | 2013-12-30 | A kind of device and method calculating the tile in electronic map visible area |
| US15/108,969 US9728167B2 (en) | 2013-12-30 | 2014-09-23 | Device and method for controlling electronic map |
| PCT/CN2014/087173 WO2015101070A1 (en) | 2013-12-30 | 2014-09-23 | Device and method for controlling electronic map |
| US15/666,245 US9972285B2 (en) | 2013-12-30 | 2017-08-01 | Device and method for controlling electronic map |
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